/Engine/Source/Editor/UnrealEd/Public/Editor.h
Delegate type for when a user requests to delete certain assets... It allows the addition of secondary assets that should also be deleted
typedef TMulticastDelegate_OneParam< void, [TArray](API\Runtime\Core\Containers\TArray)< [UObject](API\Runtime\CoreUObject\UObject\UObject) * > & > FOnAssetsAddExtraObjectsToDelete